Timothy Proctor
Sandia National Laboratories
Computer engineeringAlgorithmQuantum entanglementPhysicsStatistical physicsQuantum circuitTopologyQuantum walkTomographyQuantum informationSet (abstract data type)QubitMathematicsComputer scienceQuantum error correctionQuantum computerQuantum gateQuantum mechanicsQuantumBenchmarkingQuantum sensor
Publications 58
#2Sonika JohriH-Index: 11
Last. Timothy ProctorH-Index: 14
view all 9 authors...
In this work we introduce an open source suite of quantum application-oriented performance benchmarks that is designed to measure the effectiveness of quantum computing hardware at executing quantum applications. These benchmarks probe a quantum computer's performance on various algorithms and small applications as the problem size is varied, by mapping out the fidelity of the results as a function of circuit width and depth using the framework of volumetric benchmarking. In addition to estimati...
#1Mateusz T. MądzikH-Index: 5
#2Serwan AsaadH-Index: 6
Last. Arne LauchtH-Index: 30
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Nuclear spins were among the first physical platforms to be considered for quantum information processing, because of their exceptional quantum coherence and atomic-scale footprint. However, the full potential of nuclear spins for quantum computing has not yet been realized, due to the lack of high-fidelity multi-qubit operations, and of pathways to distribute quantum information among nuclei within a scalable device. Here we demonstrate universal quantum logic operations using a pair of ion-imp...
#1Kenneth RudingerH-Index: 13
#2Craig W. HogleH-Index: 8
Last. Irfan SiddiqiH-Index: 43
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Crosstalk is a leading source of failure in multiqubit quantum information processors. It can arise from a wide range of disparate physical phenomena, and can introduce subtle correlations in the errors experienced by a device. Several hardware characterization protocols are able to detect the presence of crosstalk, but few provide sufficient information to distinguish various crosstalk errors from one another. In this article we describe how gate set tomography, a protocol for detailed characte...
#1Robin Blume-KohoutH-Index: 27
#2S. K. ClarkH-Index: 14
Last. Kevin YoungH-Index: 16
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#1Kenneth RudingerH-Index: 13
#2Guilhem RibeillH-Index: 11
Last. Timothy ProctorH-Index: 14
view all 9 authors...
Measurements that occur within the internal layers of a quantum circuit -- mid-circuit measurements -- are an important quantum computing primitive, most notably for quantum error correction. Mid-circuit measurements have both classical and quantum outputs, so they can be subject to error modes that do not exist for measurements that terminate quantum circuits. Here we show how to characterize mid-circuit measurements, modelled by quantum instruments, using a technique that we call quantum instr...
#1Erik NielsenH-Index: 2
#2Kenneth RudingerH-Index: 13
Last. Robin Blume-KohoutH-Index: 27
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We present a simple and powerful technique for finding a good error model for a quantum processor. The technique iteratively tests a nested sequence of models against data obtained from the processor, and keeps track of the best-fit model and its wildcard error (a quantification of the unmodeled error) at each step. Each best-fit model, along with a quantification of its unmodeled error, constitute a characterization of the processor. We explain how quantum processor models can be compared with ...
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